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#1
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Q. for our electronics gurus here
We're all familiar with a guitar or bass that picks up EM noise and produces
a steady buzz through the amp. The noise goes away when the player touches some grounded piece of metal on the guitar, or the strings if the bridge is grounded. My question is why does touching a ground point eliminate the buzz? What is the player's body adding to the circuit in electrical terms? Is it just like adding a big capacitor between ground and... what, air? Or could it be that grounding the player allows the player's body to soak up some of the EMI and reduce the amount reaching the pickups? Just curious, Sean |
#2
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"Sean Conolly" wrote in message . ..
We're all familiar with a guitar or bass that picks up EM noise and produces a steady buzz through the amp. The noise goes away when the player touches some grounded piece of metal on the guitar, or the strings if the bridge is grounded. My question is why does touching a ground point eliminate the buzz? What is the player's body adding to the circuit in electrical terms? Is it just like adding a big capacitor between ground and... what, air? Or could it be that grounding the player allows the player's body to soak up some of the EMI and reduce the amount reaching the pickups? Just curious, Sean Are you sure that the metal being touched is grounded? Maybe it only gets grounded when touched. Another theory is that the metal is acting as an antenna and adding a human body into the circuit changes the resonant frequency so that it no longer is efficient at whatever frequency (60 Hz?) it was picking up before. |
#3
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"Sean Conolly" wrote in message . ..
We're all familiar with a guitar or bass that picks up EM noise and produces a steady buzz through the amp. The noise goes away when the player touches some grounded piece of metal on the guitar, or the strings if the bridge is grounded. My question is why does touching a ground point eliminate the buzz? What is the player's body adding to the circuit in electrical terms? Is it just like adding a big capacitor between ground and... what, air? Or could it be that grounding the player allows the player's body to soak up some of the EMI and reduce the amount reaching the pickups? Just curious, Sean Are you sure that the metal being touched is grounded? Maybe it only gets grounded when touched. Another theory is that the metal is acting as an antenna and adding a human body into the circuit changes the resonant frequency so that it no longer is efficient at whatever frequency (60 Hz?) it was picking up before. |
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